| 释义 |
micrometeorite|maɪkrəʊˈmiːtɪəraɪt|
[f. micro- 1 + meteorite.]
A micrometeoroid; spec. one that has entered the earth's atmosphere (cf. the distinction between meteorite and meteoroid n.).
1949F. L. Whipple in Science 28 Oct. 438/1 The term micrometeorite is here defined as an extraterrestrial body that is sufficiently small to enter the earth's atmosphere without being damaged by encounter with the atmosphere. 1956Spaceflight I. 27/1 The density of meteorites and micro-meteorites (interstellar dust) in space will also be of interest to the designers of manned research vehicles. 1967Technology Week 23 Jan. 47/1 Unlike a terrestrial observatory, it will have to have airtight quarters, well-protected against radical temperature change, hard radiation and micrometeorite bombardment. 1971I. G. Gass et al. Understanding Earth viii. 115/1 Many granules are so small that they do not offer sufficient air resistance to become incandescent; they sink to the ground as micrometeorites. 1973McGraw-Hill Yearbk. Sci. & Technol. 277/2 Bodies less than about 0·1 mm can also be expected to survive, since their size permits them to radiate the tremendous heat energy due to friction with the atmosphere before it can cause vaporization. These smaller bodies are usually called micrometeorites, or while still in space, micrometeoroids.
Hence ˌmicrometeoˈritic a.
1960H. E. Newell in J. A. Ratcliffe Physics Upper Atmosphere iii. 123 Micrometeoritic material may account for a small portion of the E-region ionization. 1974Nature 20/27 Dec. 669/2 Micrometeoritic craters. |